AD 83-04-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | DeHavilland Support Limited | Beagle B.121 Series 1 | Airworthiness Directives; BRITISH AEROSPACE, AIRCRAFT GROUP, SCOTTISH DIVISION Model B.121 Series Airplanes |
| aircraft | DeHavilland Support Limited | Beagle B.121 Series 2 | Airworthiness Directives; BRITISH AEROSPACE, AIRCRAFT GROUP, SCOTTISH DIVISION Model B.121 Series Airplanes |
| aircraft | DeHavilland Support Limited | Beagle B.121 Series 3 | Airworthiness Directives; BRITISH AEROSPACE, AIRCRAFT GROUP, SCOTTISH DIVISION Model B.121 Series Airplanes |
Unsafe Condition
Failure of the engine mounting structure due to cracks.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect the engine mounting structure for cracks in accordance with British Aerospace Service Bulletin B121/81, Issue 2. If cracks are found, repair or replace the engine mount per British Aerospace instructions. Repetitive inspections must be conducted at intervals not exceeding 50 hours time-in-service from the last inspection.
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Compliance Time
Within the next 100 hours time-in-service after the effective date of this AD or upon accumulating 1000 hours time-in-service, whichever occurs later
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Affected Aircraft
British Aerospace, Aircraft Group, Scottish Division Model B.121 series airplanes (all serial numbers)
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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